@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix ns0: <http://gcmd.gsfc.nasa.gov/kms#> .

<https://gcmd.earthdata.nasa.gov/kms/concept/bb175474-5e70-47be-8e1f-8dcd7563cc5b>
  skos:prefLabel "Magnetic Field/Electric Field Instruments"@en ;
  a skos:Concept ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/7fd394e4-bab3-4802-85d5-b7f338638d78> .

<https://gcmd.earthdata.nasa.gov/kms/concept/7fd394e4-bab3-4802-85d5-b7f338638d78>
  ns0:resource [ ] ;
  ns0:altLabel [ ] ;
  skos:definition """The EFW instrument (Electric Field and Waves) [Gustafsson et al., 1997, 2001]
on Cluster-II is part of the Wave Experiment Consortium (WEC). It consists of
four 8 cm diameter spherical probes extended on 42.5 m long wire booms (88 m
tip-tip) in the spacecraft spin plane. The probes are used for measuring either
electric fields or plasma density variations. In the electric field mode, the
probes are actively controlled by a bias current to ensure a high quality
measurement. In the density mode, the probes are voltage biased to collect the
ambient thermal electron current. Analog signals from the EFW instrument are
fed to STAFF, WHISPER and WBD. Commands to EFW and telemetry from EFW are
passed through DWP. In addition, EFW receives (via DWP) signals from FGM and
STAFF, and delivers (via DWP) the measured spacecraft potential to ASPOC.

See:
http://cluster.irfu.se/


Group: Instrument_Details
   Entry_ID: EFW
   Group: Instrument_Identification
      Instrument_Category: Solar/Space Observing Instruments
      Instrument_Class: Magnetic Field/Electric Field Instruments
      Short_Name: EFW
      Long_Name: Electric Field and Wave Experiment
   End_Group
   Group: Associated_Platforms
      Short_Name: CLUSTER-II
   End_Group
   Online_Resource: http://cluster.irfu.se/
   Sample_Image: http://sci.esa.int/science-e-media/img/33/hires_36659.JPG
   Group: Instrument_Logistics
      Data_Rate: 1.44 kbps
      Instrument_Start_Date: 2000-07-16
      Instrument_Owner: IRF, Sweden
   End_Group
End_Group"""@en ;
  skos:prefLabel "EFW"@en ;
  skos:inScheme <https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/instruments> ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/bb175474-5e70-47be-8e1f-8dcd7563cc5b> ;
  a skos:Concept .